The config file /home/nwvl7786/stats.gothilde.fr/config/config.ini.php seems to exist but Matomo could not read it.
» Please check that /home/nwvl7786/stats.gothilde.fr/config/config.ini.php is readable by the user 'nwvl7786'.

Could not find the Matomo configuration file, and you are trying to access a Matomo page.
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If you installed Matomo before and have some tables in your database, don't worry, you can reuse the same tables and keep your existing data.